Electric arc lamp for photographing



Au 30 1 2 g 9 7 H. TRAUT ELECTRIC ARGLAMP FOR-PHOTOGRAPHING Filed Dec. 24, 1926 away.

Patented Aug. 30, 1927.

UNITED STATES PATENT ori-"ics,

HEINRICH MUT, F HUNIH, GEBEIANY.

ELECTRIC ARC LAI? kIE'OBI PHOTOGRAPHING.

Application med December 24, 1928, Serial No. 156,959, and in Germany December 28, 1925.

This invention relates to an lelectric arc lamp for photographing purposes which 1s arranged so that are light' can be used for photographing at any place Where electric 5 light contacts exist. Owing to its richness in short-wave rays the arc lamp is superior for photographying purposes than incandescentlamps of high candle power, Ac cording to the invention theyarc lamp is accommodated in a case ,which can be as easily carried in the pocket as a cigar case and which is adaptedto be connected with any wall socket so that the lamp can be carried on a handle and brought towards the object to be photographed to light the same, the open cover of the case serving at the same time as reflector for the arc light.

'An embodiment of the invention is shown in the accompanying drawing, by way of 20 example, in which Fig. 1 shows the arc lamp in side elevation, the case being closed. t

Fig. 2 is a top plan view of Fig. 1.

Fig. 3 shows in cross section on line'3-3 'of' Fig. 1 the case in open position..

- The are lamp is of the commonly used simple type without regulation and 'comprising parallel carbons which, after'they have been connected to a source of current with interpositipn of a corresponding resistance for reducing the existing `voltage to about 40 volts by a simple contact with the carbon, are ignited by being touched with a carbon. The two carbons K, K' are arranged, accordingto the invention, in, a carrier J, J Two covers H, H are pivotally mounted on this carrier so that'they form, together with the carrier, a closed case for the carbons after they have been closed. The carrier consis of two side elements, J, J ofinsulating rial s aced by means of spacing blocks ,"'B". ese side elements are connected the.one..with the other by a plate C of refractory insulating material. In the gap between the two side elements J, J contact pieces D, D comprising each a contact plug S, S are inserted and rigidly connected tio the side elements by means of screws. The twoca'rbons K, K traverse each a bore ofthe plate C and project each through a borepE, E respectively of the contact pieces D,D' respectively, in which the tit ti htly so that they are securely hel in sai bores. These .bores E, E

extend` through the contact pieces from one end to the other sothat the carbons project into the gap between the side elements J, J' and can be pulled out according to requirement'. Broken off pieces of the carbon or .short remainders of carbon can be pushed out through the bores. The current contact between the contact pieces D, D and the `carbons is ensured'by the tight fitting of the carbons in the contact pieces.' Onto the plug contacts S, S a fiat contact element F with the cables is mounted, said contact element F fitting into the gap betweenthe side elements of the carrier.

The two covers H, H', are pivotally mounted in the top end and in the lower end of the side elements J J by means of pivot pins G, G and L. L. covers have inwardly curved edges which are of such width that, when the covers are closed, the front portion of the carrier and the carbons vare accommodated in the case. One of the covers has a spring hook M. Around the pivot pinsG, ral springs N, N' are wound, which securely hold the covers in the open position. The covers are mounted pivotally at the `end sides by means of flaps of their bent anges so that, at a certain angular position of the two covers the one with regard to the other, the inner edge of each cover, whichhas no ilange, bears against one side wall of the By means of grooves p into the inner surface of the covers, ribs O, O' are formed near the inner edge of the covers, said ribs forming the case,

The

reinforcing the covers. The inner sides ofA each cover forms a rcfi'ecting surface sothat the covers serve as reflectors for the arclight. A A

'Ehe ortion of the carrier which is situated' be ind the o n covers serves as handle for holding the amp when the same is in use. At one end of the carrier -a plate P is fixed by means of screws on the two side elements of the carrier and into this plate a handle Qis screwed which carries a carbon designed for igniting the lamp. This carbon projects into the gap between the side elements J, J ofthe carrier so that it is well protected against breaking.

Only one air of carbons is shown on the drawing; t ere might, however, be provlded we er more pairs 9i carboni. A corthe other an responding number of contact pieces D, D have to be provided in this case which are to be series-connected by means of the carbons.

1. An electric arc lampv for photographing purposes, comprising in combination, a case consistin of two covers, the inner surfaces of whic serve as reflectors, a carbon carrier composed of two elements of insulat' ing material spaced the one from the other and on which said covers are pivotally mounted, carbons in said carrier, contacts for said carbons, and means for connecting said contacts with any existing light con-fy tact. D l 2. An electric arc lamp for photographing purposes, comprising in combination, a case consisting of two covers the inner surfaces of which serve as reflectors, a carbon carrier formin a handle composed of two elements of insu atin material spaced the one from on which said covers are pivotally mounted, contact pieces tightly fitted in the gap between said two side elements of said carrier, carbons mounted in said contact pieces, and means for connecting said contacts with any existing light contact. 3. A11 electric arc lamp for photographing purposes, comprising in comblnation, a case consisting of two covers the inner surfaces of which serve as reflectors, a carbon carrier formin a handle composed of two elements of insu ating material spaced the one from the other and on which said covers are pivotally mounted, a

late connecting the lower ends of. said side e ements of said carrier and having two bores, contact pieces tightly fitted in the gap between said two side elements of said carrier and,Vv ha each a continuous bore, carbons moulitlf in said bores of said contact pieces so that said carbons project into said gap in the carrier, and means for connecting said contacts with any existing light contact.

4. An electric arc lamp for photographing purposes, comprising in combination, a case consisting of two covers the inner surfaces of which serveas reflectors, a carbon carrier formin a handle composed of two elements of insu ating material spaced the one from the other and on which said covers are pivotally mounted, a plate connecting the lower ends of said side elements of said carrier and havinnjtwo bores, contact pieces tightly fitted in the gap between said two side elements of said carrier and having each a continuousYrbcre, carbons mounted 1n said bores of saidvv contact ieces so that said carbons project into saidp gap in the carrier,l means for connecting I ing light contact, a plate fixed on the top ends of said side elements of said carrier, a handle screwed into said plate, and a carbon for igniting the lam carbons and fixed in the lower end of sai handle so that it projects vinto said gap in the carrier.

In testimony whereof I aiiix my signature.

HEINRICH TRAUT.

said contacts with any existf 

